diff options
Diffstat (limited to 'libs/backends/alsa/alsa_audiobackend.h')
| -rw-r--r-- | libs/backends/alsa/alsa_audiobackend.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/libs/backends/alsa/alsa_audiobackend.h b/libs/backends/alsa/alsa_audiobackend.h index e90bec5df9..ad3bb41949 100644 --- a/libs/backends/alsa/alsa_audiobackend.h +++ b/libs/backends/alsa/alsa_audiobackend.h @@ -41,6 +41,7 @@ #include "zita-alsa-pcmi.h" #include "alsa_rawmidi.h" #include "alsa_sequencer.h" +#include "alsa_slave.h" namespace ARDOUR { @@ -397,6 +398,9 @@ class AlsaAudioBackend : public AudioBackend { framecnt_t _processed_samples; pthread_t _main_thread; + /* DLL, track main process callback timing */ + double _t0, _t1; + /* process threads */ static void* alsa_process_thread (void *); std::vector<pthread_t> _threads; @@ -480,6 +484,46 @@ class AlsaAudioBackend : public AudioBackend { void update_systemic_audio_latencies (); void update_systemic_midi_latencies (); + /* additional re-sampled I/O */ + bool add_slave (const char* slave_device, + unsigned int slave_rate, + unsigned int slave_spp, + unsigned int duplex = 3); + + class AudioSlave : public AlsaDeviceReservation, public AlsaAudioSlave { + public: + AudioSlave ( + const char* device, + unsigned int duplex, + unsigned int master_rate, + unsigned int master_samples_per_period, + unsigned int slave_rate, + unsigned int slave_samples_per_period, + unsigned int periods_per_cycle); + + ~AudioSlave (); + + bool active; // set in sync with process-cb + bool halt; + bool dead; + + std::vector<AlsaPort *> inputs; + std::vector<AlsaPort *> outputs; + + PBD::Signal0<void> UpdateLatency; + PBD::ScopedConnection latency_connection; + + protected: + void update_latencies (uint32_t, uint32_t); + + private: + PBD::ScopedConnection _halted_connection; + void halted (); + }; + + typedef std::vector<AudioSlave*> AudioSlaves; + AudioSlaves _slaves; + }; // class AlsaAudioBackend } // namespace |